Add Centos GPG key custom url

When using a custom repo with centos_epel_mirror, you maybe need to
change the gpg key url because offline env

You can use this variable: lxc_centos_epel_gpg_key

Change-Id: Ia30f20df6971a9a44a69e5cc22020831a95a1489

defaults/main.yml

@@ -91,6 +91,12 @@ lxc_container_cache_path: "/var/cache/lxc/download"
 #       copy_from_host: []  # List of files to copy into the container
 lxc_cache_map: "{{ _lxc_cache_map }}"
 
+
+## If you want to use a custom epel repo
+# lxc_centos_epel_mirror: http://mirror.myconpany/epel/
+# lxc_centos_epel_gpg_key: http://mirror.myconpany/epel-key/RPM-GPG-KEY-EPEL-7
+
+
 # When using a base container to snapshot from for the overlayfs or LVM
 # copy-on-write backing stored, the base container can be set.
 lxc_container_base_name: "{{ lxc_cache_map.distro }}-{{ lxc_cache_map.release }}-{{ lxc_cache_map.arch }}"

releasenotes/notes/centos-private-epel-3fe4c9ff68ec3a18.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - You can set a private repository for epel, you must use
+    ``lxc_centos_epel_mirror`` for the repo URL and if you need to get the GPG
+    key from intranet or a mirror use ``lxc_centos_epel_gpg_key`` for gpg key
+    location.

tasks/lxc_install_yum.yml

@@ -36,7 +36,7 @@
 
 - name: Install EPEL gpg keys
   rpm_key:
-    key: "http://download.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7"
+    key: "{{ lxc_centos_epel_gpg_key | default ('http://download.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7') }}"
     state: present
   register: _add_yum_keys
   until: _add_yum_keys is success
@@ -46,7 +46,7 @@
 - name: Install the EPEL repository
   yum_repository:
     name: epel-lxc_hosts
-    baseurl: "{{ (centos_epel_mirror | default ('http://download.fedoraproject.org/pub/epel')) ~ '/' ~ ansible_distribution_major_version ~ '/' ~ ansible_architecture }}"
+    baseurl: "{{ (lxc_centos_epel_mirror | default ('http://download.fedoraproject.org/pub/epel')) ~ '/' ~ ansible_distribution_major_version ~ '/' ~ ansible_architecture }}"
     description: 'Extra Packages for Enterprise Linux 7 - $basearch'
     gpgcheck: yes
     enabled: yes